A course on the latest cultivation techniques of Sweet Potato seedlings

Sweet potato seedlings, also known as sweet potato leaves, sweet potato leaves, etc., are annual herbs of the sweet potato genus of the Convolvulaceae. Sweet potato seedlings with tender stems at the tip of sweet potato seedlings have been artificially selected for edible use. In Hong Kong, China, they are still known as "vegetable queens", "longevity vegetables" and "anticancer vegetables". They are real green vegetable products. Let's take a look at the cultivation techniques of sweet potato seedlings.

Cultivation value of Sweet Potato seedlings

Sweet potato has the characteristics of wide adaptability, strong stress resistance, drought tolerance, barren tolerance, plant absorption and regeneration, disease and insect resistance, so it is evergreen and grows vigorously in the south subtropics. Adopt all-organic cultivation, build a sunshade greenhouse, and cultivate with 45% shading black shading net. The seedlings can be directly cut and planted with sweet potato stems or top tender stems, drenched in water and moisturized, and can be picked after 15 days in summer and autumn and 30 days in winter and spring. If the stem tip of sweet potato is developed and processed into green vegetables and health food, its added value will be greatly improved. One planting can be picked all the year round, and the general yield per mu can reach more than 3000,000 kilograms.

Cultivation techniques of Sweet Potato seedlings

1. Site construction: the sweet potato seedling cultivation site should choose sunny and ventilated sandy loam, and the size should be determined according to the needs. The outer wall can be brick or mound, about 60 cm high and 20 cm wide. In order to ensure uniform heating in all corners of the field, pipelines should be laid in place, extending in all directions. If the cost is too high, the tunnel can be excavated underground, crisscross, with north-south access, and the entrance should be connected with the fire source.

2. Potato chips placement: after laying a layer of straw on the pipe or passage, sprinkle with fine soil to place the potato pieces. Potato pieces must be fresh, shiny, spotless, medium-sized and slender. To evenly place the potato pieces in the site, the longitudinal and horizontal spacing is about 2-3 cm, then sprinkle a layer of thin soil (with appropriate amount of chemical fertilizer in the soil), wet with water, and cover the wall with plastic tarpaulin.

Cultivation and Management of Sweet Potato seedlings

1. Adjust the light: sweet potato likes light. Under the condition of sufficient light, the leaf color is thicker, the leaf age is longer, the stem vine is sturdy, the stem transport tissue is developed, and the yield is higher. But sweet potato seedlings are not too demanding for sunlight, because the walls are always covered with plastic tarpaulins, which are opened only at a later stage when the temperature is already high.

2. control humidity: sweet potato is a drought-tolerant crop, but too much and too little moisture is not conducive to yield increase. The growth of sweet potato seedlings needs to control good moisture. Sweet potatoes with too little moisture will be cooked because the temperature is too high. If the humidity is too high, it should be ventilated and sunburned. In short, the dry humidity of the soil should be observed regularly and strictly controlled at about 50%.

3. Temperature regulation: the most suitable temperature for the growth of sweet potato seedlings is 20-25 degrees. If the temperature is lower than 20 degrees, the burning of firewood should be increased and the plastic tarpaulin should be covered. Above 25 degrees to reduce firewood, you can also uncover plastic tarpaulins to strengthen ventilation and cooling. Generally speaking, light a fire in early February, burn for about an hour in the morning and evening every day, and cease fire after 15-20 days, and the effect of temperature is basically small.

4. Broken soil: sweet potato seedlings begin to drill out of the soil layer about 15 days after the sun, temperature and humidity are well controlled. Due to the dense potato blocks, the whole site seems to have been raised. At this time, you should put up a plank on the fence, stand on it, lift the clod carefully, crush it with your hand, and sprinkle it evenly, so as to reduce the pressure on the growth of potato seedlings, preserve soil moisture and contribute to the growth of potato seedlings.

5. Temperature difference control: sweet potato seedlings grow fastest at night, but because of the large temperature difference between day and night, plastic tarpaulin should be covered at night, and a layer of grass mat can be laid at the same time to prevent the temperature from falling too fast, which is not conducive to the growth of potato seedlings.

6. timely picking: after the sweet potato seedlings are grown, put the boards on the fence, and when picking, people stand up and pick them carefully. if the yellowing of sweet potato seedlings will affect the sales of sweet potato seedlings, you can spray pesticides "green" to make them green, and the price will not be affected.